Issue 7, 2013
From the journal:

Analytical Methods

Determination of IO4− and Ni2+ ions using l-cysteine-CdTe/ZnS quantum dots as pH-dependent fluorescent probes†

Chao-Xia Sui,*a   Ying-Fan Liu,b   Pin-Ai Li,a   Ding Zhang*c  and  Fang Xiac  

* Corresponding authors

a Luohe Medical College, Luohe 462000, Henan, People's Republic of China
E-mail: suichaoxia2004@163.com
Fax: +86-395-2964507
Tel: +86-395-2964507

b Zhengzhou University of Light Industry, Zhengzhou 450002, People's Republic of China

c Henan Provincial Center for Disease Control and Prevention, ZhengZhou, Henan, People's Republic of China
E-mail: zhangd222@hncdc.com.cn
Fax: +86-371-68089222
Tel: +86-371-68089222

Abstract

By using L-cysteine-CdTe/ZnS quantum dots (QDs) as pH-dependent fluorescent probes, a facile and sensitive method was proposed for the selective detection of IO4− and Ni2+ ions. L-cysteine-CdTe/ZnS QDs could be used as selective fluorescent probes to determine IO4− and Ni2+ ions at different pH conditions (pH 3.5 or 10.2, respectively). L-Cysteine-CdTe/ZnS QDs at pH 3.5 exhibited a selective response for IO4− ions with a wide linear range from 5.0 × 10−8 to 2.7 × 10−6 mol L−1 and a detection limit of 3.6 × 10−9 mol L−1 (single-to-noise ratio 3). Whereas in alkaline medium (pH 10.2), L-cysteine-CdTe/ZnS QDs were able to selectively detect Ni2+ ions at 4.0 nmol L−1 with a limit of detection down to 5.9 × 10−10 mol L−1. By analysis of UV-vis absorption and time-resolved luminescence spectra, the possible mechanisms of fluorescence quenching were discussed. The proposed method using L-cysteine-CdTe/ZnS QDs as pH-dependent fluorescent probes has been successfully used to determine IO4− and Ni2+ ions in environmental water samples.

Graphical abstract: Determination of IO4− and Ni2+ ions using l-cysteine-CdTe/ZnS quantum dots as pH-dependent fluorescent probes

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Supplementary files

Article information

DOI
https://doi.org/10.1039/C3AY26426B
Article type
Paper
Submitted
20 Nov 2012
Accepted
14 Jan 2013
First published
17 Jan 2013

Anal. Methods, 2013,5, 1695-1701

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Determination of IO4− and Ni2+ ions using L-cysteine-CdTe/ZnS quantum dots as pH-dependent fluorescent probes

C. Sui, Y. Liu, P. Li, D. Zhang and F. Xia, Anal. Methods, 2013, 5, 1695 DOI: 10.1039/C3AY26426B

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